Fourier transform infrared study of polypyrrole–poly(vinyl alcohol) conducting polymer composite films: Evidence of film formation and characterization

Abstract

ABSTRACT:The electrochemical preparation of polypyrrole (PPY)-poly(vinyl alcohol) (PVA) conducting polymer composite films on an indium-tin oxide glass electrode from an aqueous solution containing a pyrrole monomer, a ptoluene sulfonate electrolyte, and a PVA insulating polymer is reported. The prepared PPY-PVA composite films were characterized by Fourier Transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and conductivity measurements. The FTIR study showed that the composite of PPY and PVA formed through bond formation between PVA and the p-toluene sulfonate dopant anion. The conductivity data of PPY-PVA showed that with increasing PVA concentration in the pyrrole solution, the conductivity of the prepared PPY-PVA film increased up to a certain level due to an increase in conjugation length, and later, it decreased with further increases in the PVA concentration in the solution due to a decrease in conjugation length. This was supported by the FTIR band intensity I 1560 /I 1480 . The TGA results show that the PPY-PVA polymer composite film was thermally more stable than the PPY film. A shielding effectiveness of 45.6 dB was exhibited by the PPY-PVA composite film in the microwave frequency range.

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

“…One approach to possibly overcome the above limitations is blending PPy with commercial insulating polymers to produce conductive polymer blends or composites [3,11,27,[29][30][31][32][33]. Among the methods mentioned in the scientific literature, melt mixing offers the advantages of large-scale production and reduced cost which are the bases for any industrial application.…”

Synthesis and characterization of polypyrrole doped with anionic spherical polyelectrolyte brushes

“…X-ray photoelectron spectroscopy (XPS) proved to be particularly useful in the surface characterization of PPy [12][13][14] because it has a typical sampling depth of 2-10 nm. Fourier transform infrared spectroscopy (FTIR) is a convenient technique to monitor changes in the structure of conducting polymer chains [15,16]. Both experimental methods [17] and theoretical model [18] have been developed to describe the dependence of conductivity on conjugation length for PPy from FTIR measurements.…”

Conducting polymer-hydrogels for medical electrode applications

“…Thus CPs alone may not be sufficient to create a long-term stable interface between synthetic implant devices and neural tissue. More recently, design and development of CP-hydrogel blends have been proposed as an approach to overcoming some of the limitations that CPs used alone may present [3,[25][26][27][28]. The underlying premise of this approach is that hydrogels may act to modulate and improve mechanical properties, as well as provide a low-fouling surface and a depot for water soluble, bioactive agents.…”